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The RTUD ratcheting take-up device is a cost-effective wood shrinkage compensation solution for continuous threaded rod systems. The RTUD is rod-diameter specific and allows for unlimited shrinkage. It is hand-installed on top of the BPRTUD (bearing plate), and after the SD9 screws have fastened the take-up device through the bearing plate and into the wood sole plate, the device provides continuous engagement with the rod, enabling the system to perform as designed at all times.
The RUD is now rated as UL-qualified through-penetration firestop systems. The devices received F (flame) and T (temperature) ratings per ASTM E814 when they are installed in conjunction with the Simpson Strong-Tie BPRTUD steel bearing plate (RTUD) or the PL steel bearing plate with top plate and nut (ATUD and TUD), eliminating the need for additional fire resistance material at the hole in the plate.
Rod Dia. (in.)
|Dimensions (in.)||Allowable Load
|Seating Increment ΔR
Allowable Load ΔA
|Average Ratcheting Force (lb.)||Compatible
|RTUD3B||3/8||2 3/4||1 1/2||1||5,180||0.044||0.010||20||BPRTUD3-4B||ATS/URS|
|RTUD4B||1/2||2 3/4||1 1/2||1||9,210||0.045||0.003||20||BPRTUD3-4B||ATS/URS|
|RTUD5||5/8||3 7/8||2||1 3/8||14,495||0.056||0.007||20||BPRTUD5-6, 5-8||ATS/URS|
|RTUD6||3/4||3 7/8||2||1 3/8||20,830||0.057||0.010||15||BPRTUD5-6, 5-8||ATS/URS|
|RTUD7||7/8||4 1/2||2 1/4||2||28,185||0.059||0.012||30||BPRTUD7-8, 5-8||ATS/URS|
|RTUD8||1||4 1/2||2 1/4||2||36,815||0.066||0.031||30||BPRTUD7-8, 5-8||ATS/URS|